CrowdStar quietly releases Hello City, new city building game on Facebook.

CrowdStar, a leading social game developer and creators of such hits as Happy Aquarium and Happy Island, have quietly released Hello City.

Hello City looks to be CrowdStar’s entry in the city-building simulation/strategy genre on Facebook made popular by Playdom’s Social City and influenced by Sid Meier’s Civilization series from back in the day.